Content debris tap with external cooling structure
By designing cooling oil grooves and chip removal grooves on the internal chip tap, an external cooling structure is achieved, which solves the problem of poor cooling effect of traditional internal chip taps, and improves the machining effect and tap service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EST TOOLS
- Filing Date
- 2025-08-12
- Publication Date
- 2026-07-07
Smart Images
Figure CN224463854U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tap technology, and belongs to a type of internal chip tap with an external cooling structure. Background Technology
[0002] In heavy and engineering machinery industries such as nuclear power, mining, and shipbuilding, many parts, such as machine bases, cylinder blocks, and pressure chambers, require machining large-diameter threaded holes. These threaded holes are mostly large-diameter, high-depth blind holes, and they are generally characterized by large workpiece weight, complex shape, and high thread precision requirements, which brings great difficulties to the machining of threaded holes. At this time, internal thread taps have emerged. Internal thread taps are special taps for machining internal threads when high requirements are required for hole depth, diameter, pitch, and thread surface quality.
[0003] like Figure 3 As shown, a traditional internal chip tap mainly consists of a cutting tooth section, a calibrating tooth section, a guide thread section, a chip removal groove section, a neck, a shank, an internal chip hole section, a center through hole section, and a cooling hole section. When machining threads with an internal chip tap, the machining process is similar to that of a traditional cutting tap. During the entire thread feeding process, the cutting tooth section first performs the cutting task, and then the calibrating tooth section shapes the thread. However, because internal chip taps are often used for machining large-diameter and deep blind holes, chip removal is more difficult. Therefore, the machined chips are not directly removed externally. Instead, they are pushed forward during the internal chip tap's feeding process until they touch the bottom of the hole. The reverse thrust from the bottom hole of the workpiece then stores the chips in the internal chip hole section. Since the depth of the machined threaded hole is relatively large, the guide thread section behind the calibrating tooth is needed for positioning and guidance to ensure the accuracy of the machined thread. The guide thread section is smaller than the calibrating tooth section and does not participate in the machining. Because internal chip taps are mostly used for machining blind holes, and the guide thread section ensures a high degree of sealing in the machined threaded hole, there are currently two main cooling methods for internal chip taps. One method involves externally pouring cutting fluid during tapping, where the fluid flows into the tap through the neck cooling hole, and the oil vapor generated during feed is also discharged from the cooling hole. The second method involves adding cutting fluid or oil to the threaded hole before tapping and then directly proceeding with the cutting. However, both methods suffer from low cooling fluidity and poor cooling effect. Furthermore, internal chip taps often machine large-diameter threads, generating significant heat during machining. If the cooling effect is inadequate, it will directly affect the tap's cutting and lubrication performance, thus impacting the quality of the machined threaded hole and reducing its surface finish and precision. Utility Model Content
[0004] To address the aforementioned technical problems, this utility model provides a chip tap with an external cooling structure.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] This application provides a chip tap with an external cooling structure, comprising an integrally connected cone, neck and shank. The cone is provided with a cutting tooth, a calibrating tooth and a guide thread from front end to rear end. The guide thread is provided with a plurality of cooling oil grooves. The front end of the cone is provided with a plurality of chip removal grooves. The cooling oil grooves and the chip removal grooves are the same in number and connected.
[0007] Preferably, the cone portion has a core hole at its center, the neck portion has a plurality of cooling holes, the neck portion has a central through hole at its center, the core hole and the central through hole are connected, and the cooling holes extend obliquely to the central through hole and are interconnected.
[0008] Preferably, the handle is provided with a mounting portion at its tail.
[0009] Preferably, the cooling oil groove extends axially through the guide thread portion and does not interfere with the neck.
[0010] Preferably, all the cooling oil tanks have a left-right symmetrical structure.
[0011] Preferably, the included angle between the front and rear surfaces of the cooling oil tank is set within 30°-40°.
[0012] Preferably, the width of each of the cooling oil grooves is the same, and is equal to the width of the outer circumference at the end of the shallowest chip removal groove among the chip removal grooves.
[0013] Preferably, the chip tap is made of high-speed steel.
[0014] Compared with the prior art, this utility model provides a chip tap with an external cooling structure, which has the following advantages:
[0015] During chip tapping, coolant is injected into the hole via external cooling. The coolant flows in from the end of the cooling oil groove near the neck, passes through the guide thread section, is then guided downwards through the cooling oil groove to the chip removal groove, and finally flows through the cutting edge. This design quickly removes cutting heat, and the increased oil capacity of the cooling oil groove significantly improves the lubrication and heat dissipation efficiency of the calibration teeth and guide thread section. This effectively improves the tap's cutting performance and machining environment, helps optimize the surface finish and accuracy of the machined threaded hole, extends tap life, and is simple in structure and highly practical.
[0016] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description
[0017] Figure 1 , Figure 2 This is a schematic diagram of the internal chip tap with an external cooling structure according to this utility model;
[0018] Figure 3 This is a schematic diagram of the structure of a standard chip tap;
[0019] In the figure: 1. Taper; 2. Neck; 3. Shank; 4. Internal chip hole; 5. Cooling hole; 6. Central through hole; 11. Cutting teeth; 12. Alignment teeth; 13. Guide thread; 14. Cooling oil groove; 15. Chip removal groove. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concepts of this utility model.
[0021] See Figures 1-2 This application provides a chip tap with an external cooling structure, comprising a cone portion 1, a neck portion 2, and a shank portion 3 integrally connected in sequence. The cone portion 1 is provided with a cutting tooth portion 11, a calibrating tooth portion 12, and a guide thread portion 13 in sequence from the front end to the rear end. The guide thread portion 13 is provided with a plurality of cooling oil grooves 14. The front end of the cone portion 1 is provided with a plurality of chip removal grooves 15. The number of cooling oil grooves 14 and chip removal grooves 15 are the same and they are connected. During the machining process, the cooling oil groove 14 increases the fluidity of the coolant, guiding it sequentially through the guide thread section 13, the calibration tooth section 12, and the tooth section 11. This quickly removes the heat generated during the cutting of the internal chip tap. At the same time, the increased oil storage space in the cooling oil groove 14 significantly improves the lubrication of the calibration tooth section 12 and the guide thread section 13 during machining, enhancing the cutting and lubrication performance of the internal chip tap. This improves the high-temperature and harsh machining environment during the cutting process, helps optimize the surface finish and accuracy of the machined threaded hole, extends the tap's service life, increases the cooling effect, and enhances the tap's cutting performance, ensuring the quality of the internal threads on the workpiece.
[0022] Preferably, the cone portion 1 has a chip-filling hole 4 at its center, the neck portion 2 has a plurality of cooling holes 5, and the neck portion 2 has a central through hole 6 at its center. The chip-filling hole 4 is connected to the central through hole 6, and the cooling holes 5 extend obliquely to the central through hole 6 and are interconnected. The cooling holes 5 are used to introduce coolant, which flows through the central through hole 6 into the chip-filling hole 4 to cool the chip-filling tap.
[0023] Preferably, the handle 3 has a mounting portion 31 at its tail.
[0024] Preferably, the cooling oil groove 14 extends axially through the guide thread portion 13 without interfering with the neck 2. The axial extension of the cooling oil groove 14 through the entire guide thread portion 13 ensures better flow of cooling oil and facilitates cooling.
[0025] Preferably, all the cooling oil tanks 14 have a left-right symmetrical structure, and the appearance of the oil tanks is not deformed and is aesthetically pleasing.
[0026] Preferably, the included angle between the front and rear surfaces of the cooling oil tank 14 is set within 30°-40° so that the cooling oil tank 14 has no cutting function, does not participate in cutting, and avoids interference with the machining process.
[0027] Preferably, the width of each of the cooling oil grooves 14 is the same, which ensures the consistency of the amount of cooling oil in each place, so as to make the temperature distribution of each cooling oil groove 14 even. The width of the cooling oil groove 14 is equal to the outer circle of the end of the chip removal groove 15 with the shallowest groove depth among the chip removal grooves 15, which ensures good connection between the chip removal groove and the cooling oil groove, thereby ensuring better flow of cooling oil.
[0028] Preferably, the chip tap is made of high-speed steel.
[0029] The cutting teeth 11, the calibrating teeth 12, the shank 3, the internal chip hole 4, and the central through hole 6 are the same as the existing conventional structures and will not be described in detail.
[0030] The working principle of this utility model:
[0031] When machining a workpiece, coolant is injected externally from the guide thread section 13 near the neck 2, flowing downwards through the cooling oil groove section 14 and into the chip removal groove section 15. The coolant then flows through the chip removal groove section 15 and through several chip removal grooves to the cutting teeth section 11, thereby quickly removing the heat generated during the cutting of the internal chip tap. At the same time, the addition of the cooling oil groove section 14 increases the oil storage space, which greatly improves the lubrication of the calibration teeth section 12 and the guide thread section 13 during the machining process, while also removing a large amount of heat generated during machining. This improves the cutting performance and lubrication performance of the internal chip tap, improves the high-temperature and harsh machining environment of the tap during the cutting process, helps to optimize the surface finish and accuracy of the machined threaded hole, and extends the service life of the tap. Moreover, this structure is simple to manufacture and has good practicality.
[0032] The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A tap with an external cooling structure, comprising a cone (1), a neck (2), and a shank (3) integrally connected in sequence, characterized in that: The cone (1) is provided with a cutting tooth (11), a calibration tooth (12) and a guide thread (13) in sequence from the front end to the rear end. The guide thread (13) is provided with a number of cooling oil grooves (14). The front end of the cone (1) is provided with a number of chip removal grooves (15). The number of cooling oil grooves (14) and chip removal grooves (15) are the same and they are connected.
2. The internal chip tap with an external cooling structure as described in claim 1, characterized in that: The cone (1) has a chip hole (4) at its center, and the neck (2) has a plurality of cooling holes (5). The neck (2) has a central through hole (6) at its center. The chip hole (4) is connected to the central through hole (6), and the cooling holes (5) extend obliquely to the central through hole (6) and are interconnected.
3. A chip tap with an external cooling structure as described in claim 1, characterized in that: The handle (3) has a mounting part (31) at its tail.
4. A chip tap with an external cooling structure as described in claim 1, characterized in that: The bottom of the cooling oil groove (14) is tangent to the bottom diameter of the guide thread (13).
5. A chip tap with an external cooling structure as described in claim 1, characterized in that: The cooling oil groove (14) extends axially through the guide thread (13) and does not interfere with the neck (2).
6. A chip tap with an external cooling structure as described in claim 1, characterized in that: The cooling oil tanks (14) are all symmetrical structures.
7. A chip tap with an external cooling structure as described in claim 1, characterized in that: The included angle between the front and rear surfaces of the cooling oil tank (14) is set within 30°-40°.
8. A chip tap with an external cooling structure as described in claim 1, characterized in that: The width of each of the cooling oil grooves (14) is the same, and is equal to the width of the outer circle at the end of the chip removal groove (15) with the shallowest groove depth among the chip removal grooves (15).
9. A chip tap with an external cooling structure as described in claim 1, characterized in that: The chip tap described is made of high-speed steel.